Table 1.
Effect of foliar application of 30 mM trehalose (Tre) and/or 1 mM salicylic acid (SA) on chlorophyll a (Chl-a) and b (Chl-b), as well as total chlorophyll (Chl), concentrations in sweet basil seedlings grown under well-watered (control) and drought stress conditions. Values are the means ± SE (n = 6). Different letters within a column indicate significant differences among means according to Duncan’s multiple-range test at the p < 0.05 level.
| Treatments | Chl-a (mg·g−1 FW) | Chl-b (mg·g−1 FW) | Total Chl (mg g−1 FW) |
|---|---|---|---|
| Control (CK) | 1.75 ± 0.006 d | 0.56 ± 0.003 d | 2.31 ± 0.004 d |
| CK + Tre | 1.87 ± 0.003 b | 0.63 ± 0.006 b | 2.50 ± 0.003 b |
| CK + SA | 1.82 ± 0.003 c | 0.60 ± 0.006 c | 2.43 ± 0.007 c |
| CK + Tre + SA | 1.99 ± 0.005 a | 0.71 ± 0.009 a | 2.70 ± 0.007 a |
| Drought stress | 0.98 ± 0.007 h | 0.34 ± 0.005 h | 1.33 ± 0.007 h |
| Drought stress + Tre | 1.43 ± 0.004 f | 0.45 ± 0.003 f | 1.87 ± 0.002 f |
| Drought stress + SA | 1.28 ± 0.005 g | 0.40 ± 0.006 g | 1.67 ± 0.004 g |
| Drought stress + Tre + SA | 1.60 ± 0.007 e | 0.50 ± 0.009 e | 2.10 ± 0.012 e |